refs #8 Added git hash to colophon

Author: tabuna

assets/colophon.html

@@ -4,6 +4,7 @@
         <p style="margin: 0; font-weight: 600; font-size: 12pt; margin-top: 0.15em;">Черняев Александр</p>
         <p style="margin: 0; font-size: 10pt; margin-top: 0.5em;">Версия 1.0, издание первое</p>
         <p style="margin: 0; font-size: 10pt; margin-top: 0.3em;">ISBN 000-0-00000-000-0</p>
-        <p style="margin: 0; font-weight: 700; font-size: 12pt; margin-top: 1em;">Липецк 2025</p>
+        <p style="margin: 0; font-size: 10pt; margin-top: 0.3em;">Коммит [commit]</p>
+        <p style="margin: 0; font-weight: 700; font-size: 12pt; margin-top: 1em;">Липецк [year]</p>
     </div>
 </div>

src/Book.php

@@ -2,6 +2,7 @@
 
 namespace Dandy\Book;
 
+use Illuminate\Support\Facades\Date;
 use Illuminate\Support\Str;
 use Mpdf\Config\ConfigVariables;
 use Mpdf\Config\FontVariables;
@@ -78,7 +79,12 @@ public function withTheme(string $themeHtml): static
      */
     public function withColophon(string $html): static
     {
-        $this->pdf->WriteHTML($html);
+        $this->pdf->WriteHTML(
+            Str::of($html)
+                ->replace('[commit]', self::getCurrentGitCommitHash())
+                ->replace('[year]', Date::now()->format('Y'))
+                ->toString()
+        );
 
         return $this;
     }
@@ -227,4 +233,23 @@ protected function addPageBreak(): void
         // $this->pdf->AddPage();
         $this->pdf->WriteHTML('<div style="page-break-after: always;"></div>');
     }
+
+    /**
+     * Attempt to retrieve the current Git commit hash in PHP.
+     * Note: This method assumes the project is using Git for version control.
+     *
+     * @return string|null
+     */
+    public static function getCurrentGitCommitHash(): ?string
+    {
+        $gitPath = '.git/';
+
+        if (! file_exists($gitPath)) {
+            return null;
+        }
+
+        $head = trim(substr(file_get_contents($gitPath.'HEAD'), 4));
+
+        return Str::of(file_get_contents($gitPath.$head))->trim()->limit(7, '');
+    }
 }